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<span id="Architecture"></span><h3 class="section">4.15 Architecture</h3>

<ul>
<li> <cite>The values or expressions assigned to the macros specified in the
headers <code>&lt;float.h&gt;</code>, <code>&lt;limits.h&gt;</code>, and <code>&lt;stdint.h&gt;</code>
(C90, C99 and C11 5.2.4.2, C99 7.18.2, C99 7.18.3, C11 7.20.2, C11 7.20.3).</cite>

<p>Determined by ABI.
</p>
</li><li> <cite>The result of attempting to indirectly access an object with
automatic or thread storage duration from a thread other than the one
with which it is associated (C11 6.2.4).</cite>

<p>Such accesses are supported, subject to the same requirements for
synchronization for concurrent accesses as for concurrent accesses to
any object.
</p>
</li><li> <cite>The number, order, and encoding of bytes in any object
(when not explicitly specified in this International Standard) (C99
and C11 6.2.6.1).</cite>

<p>Determined by ABI.
</p>
</li><li> <cite>Whether any extended alignments are supported and the contexts
in which they are supported (C11 6.2.8).</cite>

<p>Extended alignments up to <em>2^{28}</em> (bytes) are supported for
objects of automatic storage duration.  Alignments supported for
objects of static and thread storage duration are determined by the
ABI.
</p>
</li><li> <cite>Valid alignment values other than those returned by an _Alignof
expression for fundamental types, if any (C11 6.2.8).</cite>

<p>Valid alignments are powers of 2 up to and including <em>2^{28}</em>.
</p>
</li><li> <cite>The value of the result of the <code>sizeof</code> and <code>_Alignof</code>
operators (C90 6.3.3.4, C99 and C11 6.5.3.4).</cite>

<p>Determined by ABI.
</p>
</li></ul>




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